Hello,
I have Oldsmobile Delta 88 1966 Holiday Coupe original 425cui High Compresion 310HP, the car was stored for the last few years and before the sale was allegedly refurbished the original carburetor Rochester 2 JET 2bll I do not know, but whether it was properly assembled.
The cold engine has a low speed when activating the automatic choke .. I noticed on the carburetor one difference on the control side of the rods from the choke (see photo carb01 is the current carburetor and photo carb02 is the same on another same car)
What is the little stop for ?
This has an effect on the function of the choke resp. damper control ?
Is the upper flap fully closed or slightly open when the choke is activated ?

Thanks for your tips.
Lucas

 

As I frequently write, this is yet another example of why you should get a factory Chassis Service Manual if you plan to do any work on your car. From the 1966 book:




The carb in the second photo you posted is correct for your car. The carb in your first photo is a frankencarb, assembled from parts that may or may not be correct, which is unfortunately what you typically get from rebuilders. It always pays to rebuild the original carb, not replace it with a one-size-fits-none rebuilt unit.

 

Joe
thanks, I have a second carburetor that you write is correct, and I also have a carburetor kit from Fusick Automotive (code 1140) for it, so I'll probably go overhaul for the first time (I've never done it). The original factory manual Oldsmobile 1966 blue, thick, greasy I have a huge amount of information there, but I'm not a motorist :-(

 

Another question is the differences in Rochester 2 JET carburetors in cars without A / C and equipped with factory A / C? At first glance, they look identical and the markings on the carburetor body are the same.

 

They are not the same. Non-A/C with automatic is carb no. 7026052. With A/C and automatic is 7026053. These numbers are stamped on a triangular tag that is held under one of the air horn screws. The tags unfortunately got lost over the years. There are two differences, one is that the A/C carb uses a different power piston. The other is that the A/C carb uses a hot idle compensator. A/C cars were expected to have higher underhood temperatures, and this would help smooth the idle under those conditions. The hot idle compensator on a 2GC looks like this:

 

Thanks for the valuable information .. the FUSICK overhaul kit for Rochester 2 JET 2BLL carburetors will be perhaps the same for both types (with A / C and without A / C), FUSICK does not divide them in its catalog. I will reconstruct what is in the car with A / C and replace the UNLOADER LEVER (I think who refurbished this carburetor mounted it incorrectly the other way around - with a stop on the other side)

 

For what it's worth I block the hot air idle compensator valves on all of my tri carb builds. Reason is with all tri carbs being manual shift it's not needed. I have had them open before and hard to bring the idle down when the temps get high enough. Just a little info.

 

OK, but the OP has a heavy full size with A/C and an automatic.

 

I understand that and it was a for what it's worth comment. I will keep my thoughts to myself from now on.